python 装饰器

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1.装饰器 

 

 

例子:

   取sumw() 不定参数 + 字典参数  总数+(109, 20)

def sum_add(*args1):  #@sum_add(10,20)
    print(args1);#10,20
    def decorator(func):#sumw(*args,**kwargs)  da={"a":1,"b":2,"c":3,"d":4}  print(sumw(1,2,3,4,5,**da))
        print(func)
        def my_sum(*args2,**kwargs):#等同于自定义 sumw(*args,**kwargs) 函数
            my_s = 0
            for n in args1:
                my_s = my_s + n
            print(my_s)
            return func(*args2,**kwargs) + my_s
        return my_sum
    return decorator
@sum_add(109, 20)
def sumw(*args,**kwargs):  
    s = 0
    for n in args:
        s = s + n
    sq=0
    for i in kwargs:
         sq=sq+kwargs[i]
    return s+sq

da={"a":1,"b":2,"c":3,"d":4,"e":5}
# for i in da:
#     print(da[i])
print(sumw(1, 2, 3, 4, 5,**da))